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Q.5 A building space is maintained at 76°F db and 50% r.h. The peak cooling load...
A motel in Miami, Florida has a sensible cooling load of 75 tons and a sensible...
A motel in Miami, Florida has a sensible cooling load of 75 tons and a sensible heat ratio on the building of 0.85. Each of the motel's 100 rooms must be supplied with 30 cfm of outside air to satisfy the local ventilation codes. If the rooms are kept at 75F and 50% R.H., determine: a.) sketch of the system b.) Air flow to the building in cfm (fan size) c.) The mixed air condition-temperature and humidity d.) The cooling...
An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor...
An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor design condition: 100 F DB and 78 F WB Room Design Condition: 70 F DB, 50 % RH Required Outside Air: 1,800 CFM Supply Air Temperature Difference 30°F (Difference between the room temperature and the supply air temperature) Which one of the following represents the Dry Bulb'temperature of the Supply Air? 40 °F 78 OF 100 °F None of the above
An office building...
HVAC 3. A conditioned space is to be maintained at 75 F and 50% relative humidity....
HVAC
3. A conditioned space is to be maintained at 75 F and 50% relative humidity. Mark this state on the chart as ". @P6 RA". The load on this space is known to have an enthalpy to humidity ratio or psychrometric slope of 4000 BTU/Ibm. The supply air is provided at 55 F. Mark the SA state as OP6 SA What is the enthalpy for the SA found by using the chart? What is the humidity ratio for the...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (we...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (wet bulb) has a rate of sensible-heat gain of 25 kWand a rate of moisture gain of20 kg/hr. Moist air enters the space at a dry-bulb temperature of 15°C. Outdoor air at 35 C dB temperature and 25 C wB is supplied for ventilation purposes at a rate of 400 Us (litres per second) of standard air. After leaving the room,...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of 4000 cfm is blown over an evaporator of a refrigeration system and exits at 75°F and 60% relative humidity. The refrigeration system has operating with the COP of 2.5. Determine (a) the amount of cooling provided by the evaporator Btu/hr (b) the amount of water condensed in the evaporator, lbm/hr and (c) the power required by the compressor of the refrigerator in kW. 1...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the following outdoor and comfort conditions a) Outdoor design conditions = 35 °C, db and 65% R.H b) Indoor/return design conditions-26 deg C. db and 55% RH. c) Total sensible room load = 420,000 kJ/hr d) Total latent room load = 200,000 KJ/hr e) The rise in dry bulb temperature of the air inside the conference center is limited to 9 °C (i.e. the Supply...
a. the sensible heat ratio (SHR) for the cooling and dehumidifying process; (2 Marks) b. the...
a. the sensible heat ratio (SHR) for the cooling and
dehumidifying process; (2 Marks) b. the supply air volume flow rate
to the office in m3 /s; (5 Marks) c. the air dry bulb temperature
and specific enthalpy of the mixture of outdoor and recirculating
air; (4 Marks) d. the cooling coil’s load in kW. (5 Marks) e. the
apparatus dew point during the cooling and dehumidifying process;
and (4 Marks) f. Discuss, with reasons, the possible effects on the...
An office building requires the following cooling load: RSCL = 480,000 BTU/hr RLCL 250,000 BTU/Hr Outdoor design condition: 100 F DB and 78 F WB Room Design Condition: 70 F DB, 50 % RH Required Outside Air: 1,800 CFM Supply Air Temperature Difference 30°F (Difference between the room temperature and the supply air temperature) Which one of the following represents the Dry Bulb'temperature of the Supply Air? 40 °F 78 OF 100 °F None of the above
An office building...
HVAC
3. A conditioned space is to be maintained at 75 F and 50% relative humidity. Mark this state on the chart as ". @P6 RA". The load on this space is known to have an enthalpy to humidity ratio or psychrometric slope of 4000 BTU/Ibm. The supply air is provided at 55 F. Mark the SA state as OP6 SA What is the enthalpy for the SA found by using the chart? What is the humidity ratio for the...
PROBLEM 2. (20 POINTS) A space to be maintained at 25 C dB (dry bulb) temperature and 18°C wB (wet bulb) has a rate of sensible-heat gain of 25 kWand a rate of moisture gain of20 kg/hr. Moist air enters the space at a dry-bulb temperature of 15°C. Outdoor air at 35 C dB temperature and 25 C wB is supplied for ventilation purposes at a rate of 400 Us (litres per second) of standard air. After leaving the room,...
Q.3 Outside air at 90°F, 1 atm, and 95% relative humidity with a flow rate of 4000 cfm is blown over an evaporator of a refrigeration system and exits at 75°F and 60% relative humidity. The refrigeration system has operating with the COP of 2.5. Determine (a) the amount of cooling provided by the evaporator Btu/hr (b) the amount of water condensed in the evaporator, lbm/hr and (c) the power required by the compressor of the refrigerator in kW. 1...
An Conference Center is to be air-conditioned for a seating capacity of 3200 people for the following outdoor and comfort conditions a) Outdoor design conditions = 35 °C, db and 65% R.H b) Indoor/return design conditions-26 deg C. db and 55% RH. c) Total sensible room load = 420,000 kJ/hr d) Total latent room load = 200,000 KJ/hr e) The rise in dry bulb temperature of the air inside the conference center is limited to 9 °C (i.e. the Supply...
a. the sensible heat ratio (SHR) for the cooling and
dehumidifying process; (2 Marks) b. the supply air volume flow rate
to the office in m3 /s; (5 Marks) c. the air dry bulb temperature
and specific enthalpy of the mixture of outdoor and recirculating
air; (4 Marks) d. the cooling coil’s load in kW. (5 Marks) e. the
apparatus dew point during the cooling and dehumidifying process;
and (4 Marks) f. Discuss, with reasons, the possible effects on the...
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